Best AI Email Assistants in 2026: 13 Compared
Drafting is solved. Every tool here writes a decent reply.
What isn’t solved is trust. Most AI email assistants sort your mail by their own idea of what matters, behave a little differently every day, and work one account at a time. The one worth paying for follows your rules, the same way every time, across every inbox you have.
The quick answer: Carly is the best AI email assistant in 2026. It labels, sorts and answers every new email across all of your Gmail and Outlook accounts by rules you write in plain English, and it runs them reliably with your laptop shut. It also turns scheduling emails into booked meetings, texts you when something urgent lands, and plugs into ChatGPT, Claude, Grok Bot, Meta Muse and Perplexity. Free Zapier-style workflows; AI agents from $35/month. Connect your inbox here.
Quick comparison
| Tool | Gmail | Outlook | Sorts mail on its own | Sends mail | Entry price |
|---|---|---|---|---|---|
| Carly | Yes | Yes | Yes, by your rules | Yes | Free workflows; agents $35/mo |
| Fyxer | Yes | Yes | Yes, into its own labels | Drafts for review | Free; Pro $37/mo |
| Superhuman Mail | Yes | Microsoft 365 | Auto Labels | Yes | $30/mo |
| Shortwave | Yes | No | AI filters, Business+ | Yes | Free; Pro $18/mo |
| Lindy | Yes | Yes | Yes, on credits | Yes | Free trial; $29.99/mo |
| ChatGPT | Yes | Yes | Tasks on some app events | On confirmation | Plus $20/mo |
| Claude | Yes | Business organizations | On a schedule | Yes | Free; Pro $20/mo |
| Microsoft Copilot | No | Yes | Inside Outlook | Yes | $21/user/mo annual |
| Gemini in Gmail | Yes | No | Spark monitors | Yes | Free tier; $9.99/mo |
| SaneBox | Yes | IMAP | Yes, server-side | No | $9.49/mo |
| Spark Mail | Yes | Yes | Smart Inbox | Yes | Free; Plus $10/mo |
| Front | Shared channels | Shared channels | Yes, playbooks | Yes | $25/seat/mo annual |
| Missive | Yes | Yes | Yes, rules | Yes | AI plan $24/user/mo |
What to look for
- Whose rules sort the mail. Gmail, Fyxer and Superhuman decide what’s important for you. The better tools let you say what matters and then stick to it.
- Every account at once. If you run a work and a personal inbox, or Gmail and Outlook, check that one assistant covers all of them.
- Whether it works when you don’t. Some tools act when mail arrives. Most wait for you to open an app or a chat.
- What happens after the email. A scheduling request should end as a calendar event, an invoice as a bookkeeping entry, a lead as a CRM record.
1. Carly
Carly is the AI email assistant you can rely on and shape to the way you work. Instead of a model guessing what matters, Carly follows your rules: “Clients get labeled and flagged. Invoices go to Accounting and get logged in QuickBooks. Cold pitches get archived. Text me if Claire writes about the contract.” It applies them to every new email across all of your Gmail and Outlook accounts, the same way every time, with your laptop shut, because workflows run in the cloud. Change a rule by just saying so.
- Labeling and sorting. Every message labeled, filed and prioritized by your rules, across Gmail and Outlook together. See it set up, or watch this Outlook walkthrough that sorts every new email into the right folder.
- Replies and follow-ups. Carly drafts or sends from the right account, with approval steps where you want them, and follow-ups stop when someone replies.
- Calendar. A “can we move Thursday?” email becomes a moved meeting, checked against all of your calendars. Everyone else gets free booking pages and group polls.
- Calls and texts. Get a text when urgent email lands, and let Carly answer your business line and text back missed calls.
- Everything after the email. Your CRM, tasks and files, across thousands of apps, plus custom agents with their own instructions and memory.
- Inside the AI you already use. Add Carly to ChatGPT, Claude, Grok Bot, Meta Muse or Perplexity and all of this works from that chat.
Best for: anyone who wants every inbox sorted, labeled and answered by their own rules
Pricing: Free Zapier-style workflows; AI agents from $35/month
Limitations: Carly is not an inbox interface, so pair it with the client you already like. A managed Workspace or Microsoft 365 organization may need administrator approval.
Why it stands out: the built-in AI sorting in Gmail, Fyxer and Superhuman decides for you. Carly does it your way, every time, on every account. Start here.
2. Fyxer
The best-known AI email assistant. It sorts incoming mail into its own labels, drafts replies in your tone for you to review, and records meetings to write the follow-up. Gmail and Outlook.
Best for: one busy inbox full of routine email
Pricing: Free plan; Pro $37/mo billed annually ($49 monthly); Team $64 ($99 monthly)
Limitations: Sorting follows Fyxer’s categories, drafts wait for you to send them, and several inboxes at once needs the Team plan. See Fyxer alternatives and Fyxer pricing.
3. Superhuman Mail
The fastest inbox to live in, with split inboxes, keyboard-first triage, Auto Drafts that prepare responses as mail arrives, Auto Labels, and Auto Archive. Superhuman Go adds user-invoked actions including sending mail, managing calendars, and updating tools such as Jira.
Best for: keyboard-first processing by someone who wants to be in their inbox
Pricing: Starter $30/mo or $300/yr; Business $40/mo adds Auto Drafts, Ask AI, CRM integrations, and Mail MCP
Limitations: Auto Drafts stay drafts rather than going out, and Go actions run when you invoke them. See Superhuman pricing.
4. Shortwave
An AI-native Gmail client with strong natural-language search, summaries, bundles, calendar actions, and AI filters that automate defined inbox actions.
Best for: Gmail search and AI organization
Pricing: Free; Pro $18/mo or $14 annual; Business $30 adds AI filters, integrations, and MCP
Limitations: Gmail and Google Workspace only. Microsoft 365 and Exchange are unsupported, and while Outlook.com can be forwarded in, Shortwave cannot send from that address.
5. Lindy
An AI executive assistant that sorts your inbox, drafts replies in your voice, schedules meetings and texts you what matters over iMessage or SMS. Gmail and Outlook.
Best for: inbox help by text, if you’re happy to manage credit spend
Pricing: Free trial with $50 in credits for 7 days; paid from $29.99/mo for 3,000 credits
Limitations: Every action spends credits, so a busy month costs more. See Lindy alternatives.
6. ChatGPT
Deeper on mail than its reputation suggests. It searches with structured syntax such as from: and subject:, returns full message bodies, and sends from the connected account with a confirmation step.
ChatGPT drafts and sends from a connected Gmail or Outlook account, with you confirming each send. Claude sends too: its Gmail connector drafts, sends, replies and forwards, and its Microsoft 365 connector does the same once an admin enables the write tools, though that one rejects anything with an attachment. Both need you in the conversation. Carly sends the reply while you are away, attachments included.
Its real differentiator is shared and delegated mailboxes: give it the mailbox owner address and it reads that mailbox, browses folders, moves messages, and sends on behalf of it.
Best for: a shared support or billing alias
Pricing: Plus $20/mo; Business $25/user/mo, or $20 annual, two-user minimum
Limitations: Tasks can now start from a new Gmail message and from events in other supported apps, but most work still happens with you in the chat. On the Microsoft side an Entra administrator must grant organization-wide consent. Add Carly to ChatGPT to give it Carly’s rules, sorting and calendar work.
7. Claude
The Gmail connector drafts, sends, replies and forwards. The Microsoft 365 connector reaches Outlook, SharePoint, OneDrive and Teams on every plan including Free, and once an admin enables its write tools it sends mail and manages calendar events too. Claude Cowork runs the same connectors on a schedule.
Best for: careful writing, and business Microsoft organizations that need calendar writes
Pricing: Free; Pro $20/mo; Max from $100/mo; Team $25/seat monthly
Limitations: Personal Microsoft accounts cannot connect, so @outlook.com and @hotmail.com are out. Microsoft 365 write tools reject attachments, and scheduled tasks run on a clock rather than when mail arrives. Adding Carly to Claude gives it Carly’s labeling and calendar work.
8. Microsoft Copilot
Summarizes threads, drafts, coaches writing, triages mail, schedules meetings, and creates invitations from threads, all inside Outlook.
Best for: Microsoft-native mail and calendar work
Pricing: Microsoft 365 Copilot Business lists at $21/user/mo annual or $25.20 monthly, plus a qualifying Microsoft 365 subscription
Limitations: Availability varies by Outlook app, mailbox type, organization settings, and licence, so confirm the specific action rather than assuming every Copilot surface has it. No Gmail.
9. Gemini in Gmail
Built into Gmail, with summaries, search, Drive context, and calendar event creation in eligible experiences. Gemini Spark adds schedules plus Gmail-filter and topic monitors on eligible paid personal accounts.
Best for: Google users who want something already installed
Pricing: some free features; Google AI Plus from $9.99/mo, Pro $19.99; included in current Workspace Business editions
Limitations: Account type, country, language, plan, admin settings, and rollout all gate it, Spark skips work and school accounts, and there is no Microsoft side at all.
10. SaneBox
Learns priority from message metadata and your corrections, then files lower-priority mail into folders such as SaneLater. Because it works at the server level, the result shows up in whatever client you use.
Best for: server-side priority sorting with no new app
Pricing: Snack $9.49/mo, or $109 for two years
Limitations: Sorting rather than doing. It does not draft, schedule, or update other systems.
11. Spark Mail
Supports Gmail, Microsoft 365 and Exchange Online, iCloud, Yahoo, and IMAP. Smart Inbox is free, and a limited AI preview can write, summarize, search, send, archive, and create calendar events within its allowance.
Best for: a low-cost client across many providers
Pricing: Free with limited AI; Plus $10/mo or $8.25 annual; Pro $20 or $16.58 annual
Limitations: Workflows are still marked “SOON,” and Auto-Labels and Auto-Drafts are limited betas rather than generally available automation.
12. Front
Shared inboxes, assignment, SLAs, and customer context, with Autopilot playbooks that collect missing information, act in connected systems, reply, resolve, or hand off with context.
Best for: customer-operations teams, not personal inboxes
Pricing: Starter from $25/seat/mo annual, plus outcome-priced Autopilot at $0.05 per triaged conversation, $0.39 per handoff, $0.89 per resolution
Limitations: The team controls are the product. A solo user pays for structure they will not use.
13. Missive
Shared inboxes, assignments, comments, collaborative drafts, AI rules, webhooks, and an API. Rules can classify, label, route, create tasks, prepare drafts, and send automatic responses.
Best for: collaborative drafting and rule automation
Pricing: Starter $14/user/mo annual, but AI and rules need Productive at $24 or Business at $36, plus your own OpenAI, Anthropic, or Gemini account and usage
Limitations: The real price is the AI-capable plan plus model usage, not the advertised Starter tier.
How to pick
If you want every inbox sorted, labeled and answered by your own rules, reliably, across Gmail and Outlook, go with Carly. It also turns email into booked meetings, texts and CRM updates, and works inside ChatGPT, Claude, Grok Bot, Meta Muse and Perplexity.
If your inbox just feels slow, buy a better client: Superhuman for keyboard-first triage, Shortwave for Gmail search. If you want drafts written for one inbox, Fyxer. If a shared or delegated mailbox is the real pain, ChatGPT handles it natively. For pure server-side sorting, SaneBox. For customer operations, Front or Missive.
For provider-specific picks, see best AI assistants for Gmail, best AI assistants for Outlook, AI assistants for multiple email accounts, and best AI email agents.
FAQ
What is the best AI email assistant in 2026?
Carly. It labels, sorts and answers every new email across all of your Gmail and Outlook accounts by your own rules, runs them the same way every time, and carries the work into your calendar, CRM, texts and calls.
Can an AI email assistant sort my email automatically?
Yes. Carly sorts and labels by rules you write in plain English, across all of your accounts. Fyxer and Superhuman sort into their own categories, SaneBox files by learned priority, and Front and Missive run team rules.
Do AI email assistants work with both Gmail and Outlook?
Some do. Carly does, along with Fyxer, Lindy, Spark and Missive. Superhuman covers Google-hosted and Microsoft 365-hosted accounts but not on-premises Exchange, Shortwave is Gmail-only, and Copilot is Microsoft-only. ChatGPT connects both and sends from either; Claude sends through Gmail and through Microsoft 365 once write tools are on, but its Microsoft connector needs a business organization, so personal @outlook.com and @hotmail.com addresses cannot connect.
Can I use an AI email assistant inside ChatGPT or Claude?
Yes. Add Carly to ChatGPT, Claude, Grok Bot, Meta Muse or Perplexity, and Carly’s sorting, replies, calendar work and texts are all available from that chat.
What is the difference between an AI email assistant and an AI email agent?
The labels are marketing and the categories overlap. Compare what starts the work (you, or the email arriving), whether sending needs approval, which systems it can write to, and whether it runs with nothing open. Carly is built around the email arriving; most of this list is built around you asking.
Can an AI email assistant reply without me opening anything?
Only a few. Most tools here act when invoked. Carly’s workflows start from the email arriving and run in the cloud, SaneBox sorts server-side, and Front and Missive run playbooks and rules. Superhuman’s Auto Drafts and Fyxer’s drafts wait for you to send them.
Are AI email assistants safe?
They need meaningful mailbox access, so it depends on the product, plan, and configuration. Review OAuth scopes, message storage, retention and training terms, admin controls, action history, and revocation. Carly does not use your data to train AI models, and you set approval steps so an agent can search freely while sends stop for review.
How much do AI email assistants cost?
Individual plans in this comparison run roughly $10 to $50 a month. Carly includes free Zapier-style workflows, with AI agents from $35/month. Watch the team tools: Missive AI needs Productive plus model usage, Front adds outcome-priced Autopilot, and Microsoft 365 Copilot requires a qualifying base subscription on top.
Ready to automate your busywork?
Carly schedules, researches, and briefs you—so you can focus on what matters.
See what people say
"Before Carly, I relied on a Calendly link, but the whole process felt impersonal and not very professional. Carly changed that by handling all the back-and-forth, so I'm no longer stuck in endless email threads trying to line up schedules.
Now Carly reaches out to candidates, shares my real-time availability, lets them pick a slot, then sends a Zoom link and drops it straight into my calendar. She sends reminders to both of us before each call, which has significantly reduced no-shows and last-minute confusion.
On top of scheduling, Carly acts like a full executive assistant, sending me my schedule the night before so I can prepare for each call. It reminds me of the old x.ai assistant, but Carly is noticeably smarter, faster, and better suited to my healthcare recruitment business."
